ISSN:
1432-2048
Keywords:
Avena (phototropism)
;
Apex (coleoptile)
;
Phototropism
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract The differential growth causing second positive phototropic curvature in intact, black-capped and decapitated Avena coleoptiles has been measured. In all cases the curvature is brought about by a cessation in growth of the illuminated side. The fact that shading the apex does not significantly alter the initial steps of differential growth means that the subapical zones can perceive and respond to unilateral illumination. Decapitation significantly reduces coleoptile growth, especially in the most apical zone. However, the fact that differential growth is still evident in the other zones of decapitated coleoptiles within 30 min of unilateral illumination requires one to conclude that the apex cannot be controlling the differential growth in those basal zones.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00429452
